1. 10.5 Tangents Tangent: a line that shares only one point with a circle and is perpendicular to the radius or diameter at that point. Point of tangency: the point that a tangent shares with a circle Two lines that are tangent to the same circle and meet at a point, are congruent from that point to the points of tangency

2. F E A B C Lines AC and AF are tangent to circle X at points B and E respectively -B and E are points of tangency Radius XB is perpendicular to tangent AC at the point of tangency AE and AB are congruent because they are tangent to the same circle from the same point X

3. A. Copy the figure and draw the common tangents to determine how many there are. If no common tangent exists, choose no common tangent.